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Host Nate Wilcox welcomes Dave Thopson to kick off a new mini-series on his book “An Evolving Tradition: The Child Ballads in Modern Folk and Rock Music.” The song lyrics collected by Francis J. Child in the 19th Century have contributed mightily to the repertoire of the people we often call “folk singers” from Pete Seeger to Ewan MacColl, from Leadbel…